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Description:
4.Material
sliprings of carbon brush is carbon, do notwear-resisting;
sliprings of precious metal brush isgold-gold, long-life;
6.Preserving
sliprings of carbon brush isn''t completesealing, is easily corroded
sliprings of precious metal brush is highdegree of protection
7.Price
sliprings of precious metal brush is evryvaluable.
